Blood Moon cares only that a land is non-basic, and doesn’t look at the land’s abilities at all. So regardless of the order of the two effects, (1) the land loses all abilities and (redundantly) all non-mana abilities, and (2) becomes a mountain and gains the mountain’s implicit mana ability.

(Also Ancient Tomb’s damage rider is part of the mana ability, so it stays. City of Brass and Forbidden Orchard side-effects are triggered abilities and are removed. Amusingly, under the new Ixalan rules for how EtB replacement effects are handled, the infamous Lotus Vale also loses its sacrifice clause.)

Obviously, though not previously mentioned, it hoses Fetches. Also Library of Alexandria.

As previously pointed out, it hoses Orchard to the extent that it prevents Orchard from giving creatures, but Orchard still taps for 5 colors.

This also interacts very favorably with Ancient Tombs which any deck running this would probably also use, and critically, it helps solve the biggest problem in Blood Moon decks - stopping them from finding that basic island.

This also turns City of Brass into a no downside 5 color land... ??? (That is a question) Very, very interesting card.

This card, while probably not something you would run next to bloodmoon effects, may be strictly better in some match ups in multiple formats. No mana from fetches is way scarier than red mana. I'll def be hoarding some copies and I think it could easily slot into existing modern and legacy lists.

Also, does this hose cycler lands, riftstone portal, and the dredge land when they are not in play? I assume it does but I cant be sure, not so brushed up on m static effects rules.

@protoaddct Good list, except Horizon Canopy is probably more hosed by Blood Moon than this.

Arguable and situational most likely. Both cases it loses the sac outlet which really is the primary mode for the card. I think sun is likely worse for the other player because a) you drew a card and B) they still have to pay life for the mana.

If the rules allow Lotus Vale to enter the battlefield without restictions unders this card, then I assume those same rules mean Lotus Vale can be played under blood moon, put directly into play without sacrificing lands, and as a mountain. Is that right, can someone please confirm this.